Ayatollah Hashem Bathaei-Golpaygani was a member of the Assembly of Experts, which selects the country's supreme leader.
"In pursuing the case of the downed plane, justice will be implemented irrespective of any circumstances," Iran's judiciary chief said.
"Instead of caving, Iran is moving step by step out of the nuclear deal and in recent months it hit six ships, attacked Saudi oil facilities and set fire to the U.S. embassy in Baghdad," Chris Wallace pointed out.
Thousands took to the street, calling on Supreme Leader Ali Khamenei to resign.
Commander Amir Ali Hajizadeh revealed an operator made the decision to fire at the aircraft in 10 seconds.
All 176 passengers and crew on board the Ukrainian Airlines flight died in the crash.
Ali Akbar Velayati said that the U.S. "took a foolish move" by assassinating Qassem Soleimani "and they must leave the region."
"Be cautious before going to public places," the Chinese embassy in Washington warned its citizens.
An Iranian government spokesperson blamed the "bullying policy" of the U.S. and the "lack of resistance" by the Europeans,
"Iran wanted me to lift the sanctions imposed on them in order to meet. I said, of course, NO!" President Trump tweeted Friday.
"Our region is on the edge of collapse, as a single blunder can fuel a big fire," Rouhani warned fellow Middle East leaders.
In a Fox News interview, Iranian president Hassan Rouhani claimed the U.S. was a proponent of terrorism in the Middle East.
The energy secretary said Iran "could pay a very dear price economically" but added that Trump is "not interested in going to war."
Iranian parliament speaker Ali Larijani also labeled an American-led coalition currently stationed to protect commercial interests in the area "a new means for plundering the region."
"This is why it's so important to have a president who isn't a typical politician," the senior White House counselor said.
With diplomacy on the horizon, activists are continuing to call for democratic change in Iran—but that doesn't mean they want U.S. intervention.
The president may already be tiring of a maximum pressure policy that has resulted in much less than its supporters predicted.
President Hassan Rouhani added that the "outrageous and idiotic" U.S decision to impose sanctions meant the "certain failure" of American efforts.
"The entire world recognizes the U.S. as a country reneging on its promises," President Hassan Rouhani said on Tuesday.
"That's a very serious issue if they continue to do that," Trump's national security adviser warned.
"Washington is deliberately provoking Iran," Russian Foreign Ministry spokesperson Maria Zakharova claimed.
"You use terrorist groups against the peoples of the region and yet claim to have been fighting terrorism?" President Hassan Rouhani asked.
"No one can defeat a nation which pursues resistance," Iranian President Hassan Rouhani said in a televised address, claiming the U.S. and its allies were to blame for the country's poor economy.
Russian President Vladimir Putin, Turkish President Recep Tayyip Erdogan and Iranian President Hassan Rouhani met in the Black Sea city of Sochi, Russia, to discuss bringing the Syrian conflict to a close.
The president has lobbed attacks at the leaders of some of America's closest allies, as well as those of international rivals.
After taking office, President Donald Trump quickly appointed son-in-law Jared Kushner, the husband of his daughter Ivanka, as a senior adviser with a wide-ranging portfolio.
"The United States is a regime formed on the basis of capitalism, racial discrimination and hegemonism," Major General Mohammad Ali Jafari said.
"We will not obey such sanctions," Turkish President Recep Tayyip Erdogan said, adding that his government saw Washington's move as "violating the global balance."
"U.S. bullying is backfiring," Foreign Minister Javad Zarif warned earlier on Monday.